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Forklift Mast

a technology of forklifts and masts, applied in the field of forklift masts, to achieve the effect of reducing the rigidity to the weight ratio

Inactive Publication Date: 2009-01-29
ROCLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]The integral beam of the invention achieves a very advantageous rigidity to weight ratio.

Problems solved by technology

Deviations from this would immediately entail problems of heat extrusion or cold drawing, and at some stage, would prevent the use of the method depending on the process parameters.

Method used

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Examples

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Embodiment Construction

[0027]FIG. 1 illustrates a known version of a mast forklift. The frame 1 of the mast forklift comprises an attached mast construction and hydraulic cylinder construction 2, by means of which the hoisting cradle 3 can be lifted. In this case, the hoisting cradle 3 is a fork cradle. The hoisting cradle 3 is lifted in two or more steps depending on the mast construction.

[0028]FIG. 2 is a cross-sectional top view of the mast construction of the mast forklift of the invention. The figure illustrates the integrally constructed substantially vertical beams 4 and 5, comprising integrated cylinder liners 6 with pistons 7 and 8. The cylinder liners 6 are borings extending longitudinally through the integral beams 4 and 5, the borings being sealed e.g. at their lower end by a pressure bushing or a plug and equipped at their upper end with packing boxes 9 in order to seal and guide pistons 7 and 8. The packing boxes have been mounted by welding or any similar method outside the cylinder liners,...

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Abstract

The invention relates to the mast-hydraulic cylinder construction (4, 5) of a two or multiple-stage forklift mast. The substantially vertical beams (4, 5) and cylinder liners (6) of the solid mast structure form an integrated structure (4, 5), in which the cylinder liners (6) consist of ducts integrated within the beams (4, 5), with the mass centre of the cross-section of the integrated structures being at the centre of the cylinder liner (6) or in its immediate vicinity so that the integrated structure (4, 5) can be manufactured by heat extrusion or cold drawing, and in that the integrated structure (4, 5) comprises a first protrusion (14), whose surface is a bearing surface (17) for a roller bearing (16), and a second protrusion (15) for providing a mass centre at the centre of the cylinder liner (6), and a support surface (18, 19) substantially transverse to the direction of movement of the forklift. The invention also relates to a method for producing an integrated structure (4, 5).

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is for entry into the U.S. national phase under §371 for International Application No. PCT / FI05 / 000315 having an international filing date of Jul. 5, 2005, and from which priority is claimed under all applicable sections of Title 35 of the United States Code including, but not limited to, Sections 120, 363 and 365(c), and which in turn claims priority under 35 USC §119 to Finnish Patent Application No. 20040942 filed on Jul. 6, 2004.TECHNICAL FIELD[0002]The invention relates to a forklift mast. More specifically, the invention relates to a forklift mast comprising two or more stages, which is either solidly or tiltingly fixed to the frame and is formed of a first pair of substantially vertical beams, which are interconnected by at least one substantially horizontal beam, the parts forming a solid mast structure, with at least one second pair of substantially aligned vertical beams disposed in the vicinity of the construct...

Claims

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Application Information

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IPC IPC(8): B66F9/08B21D47/00B66F
CPCY10T29/49625B66F9/08
Inventor POLVILAMPI, JANNE
Owner ROCLA
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